Alert archive / South Carolina / Flash Flood Warnings in 2002

Flash Flood Warning 4, NWS Charleston, SC

August 29, 2002Colleton County, South Carolina

NWS Charleston, SC issued this flash flood warning at Aug 29, 2002, 12:47 PM EDT for Colleton County, South Carolina. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 29, 2002, 12:47 PM EDT (16:47 UTC)
Expired: Aug 29, 2002, 3:45 PM EDT
In force: 3 hr
Issued by: NWS Charleston, SC
Area: Whole counties

County Colleton County, SC

The radar

The Charleston,SC radar (KCLX), 42 km from the middle of the area, began a volume at 16:50 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 4.8 hours before the alert went out and 61 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 38 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 480 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 181 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS52 KCHS 291647
FFWCHS
SCC029-291945-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
1247 PM EDT THU AUG 29 2002

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  COLLETON COUNTY IN SOUTHEAST SOUTH CAROLINA...

* UNTIL 345 PM EDT.

* AT 1247 PM EDT...RADAR INDICATED VERY HEAVY RAIN PERSISTING ACROSS 
  NORTHERN COLLETON COUNTY FROM CANADYS TO SIDNEY SOUTH TO WALTERBORO
  AND HENDERSONVILLE. RADAR ESTIMATES AS MUCH AS 2 TO 4 INCHES OF
  RAIN HAS FALLEN ACROSS IN THESE AREAS WITH AS MUCH AS 5 TO 6.5 
  INCHES BETWEEN CANADYS AND SIDNEY. ADDITIONAL HEAVY RAIN WILL 
  PRODUCE DANGEROUS FLASH FLOODING.

* SOME LOCATIONS AFFECTED INCLUDE...
  CANADYS...SIDNEY...WALTERBORO...HENDERSONVILLE...RHODES CROSSROADS...
  HIGHWAY 15 BETWEEN CANADYS AND HENDERSONVILLE...HIGHWAY 17 BETWEEN
  WALTERBORO AND ROUND O.

DANGEROUS FLASH FLOODING IS LIKELY IN PROGRESS. DO NOT ATTEMPT TO
DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. MOST FLASH FLOOD
DEATHS OCCUR IN AUTOMOBILES. SEEK HIGHER GROUND IMMEDIATELY.

$$

LAT...LON 3277 8084 3276 8065 3303 8042 3306 8048
          3306 8061 3309 8070

ST

2 follow-up statements

000 
WGUS72 KCHS 291857
FFSCHS
SCC029-035-291945-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
255 PM EDT THU AUG 29 2002

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR BOTH COLLETON AND 
DORCHESTER COUNTIES UNTIL 345 PM...

ALTHOUGH THE HEAVY AND STEADY RAINS ARE BEGINNING TO SLACKEN THIS 
AFTERNOON...CONSIDERABLE STANDING WATER FROM EARLIER RAINS WILL MAKE 
FOR A TREACHEROUS SITUATION THIS AFTERNOON.

MANY ROADS AND LOW-LYING AREAS FROM RIDGELAND AND SAINT GEORGE TO 
COTTAGEVILLE...WALTERBORO AND ISLANDTON HAVE EXPERIENCED SOME OF THE 
WORST FLOODING. RAINFALL ESTIMATES FROM DOPPLER RADAR HERE AT THE 
NATIONAL WEATHER SERVICE...INDICATE THAT UP TO 4 TO 8 INCHES OF RAIN 
HAS FALLEN SINCE BEFORE MIDNIGHT...LAST NIGHT.

ADDITIONAL RAINS THIS AFTERNOON WILL BE LESS THAN AN ADDITIONAL 
INCH...BUT THIS WILL BE ENOUGH TO MAINTAIN A FLOODING SITUATION 
ACROSS PARTS OF YOUR COUNTY. THUS...A FLASH FLOOD WARNING REMAINS IN 
EFFECT UNTIL 345 PM.

MOST FLASH FLOOD DEATHS OCCUR IN VEHICLES. DO NOT DRIVE INTO AREAS 
WHERE WATER COVERS THE ROADWAY OR DIVE AROUND POLICE BARRICADES. 
RAPIDLY RISING WATER CAN ENGULF A VEHICLE AND ITS OCCUPANTS. IF YOUR 
VEHICLE STALLS IN WATER...ABANDON IT IMMEDIATELY AND SEEK HIGHER 
GROUND.

STAY TUNED TO NOAA WEATHER RADIO OR THIS STATION FOR THE LATEST 
WEATHER INFORMATION FROM THE NATIONAL WEATHER SERVICE. ADDITIONAL 
INFORMATION IS ALSO AVAILABLE ON THE INTERNET AT WCHS.CSC.NOAA.GOV.

$$

PM

000 
WGUS72 KCHS 291948
FFSCHS
SCC029-035-291950-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
345 PM EDT THU AUG 29 2002

...THE FLASH FLOOD WARNING FOR COLLETON AND DORCHESTER COUNTIES HAS 
BEEN ALLOWED TO EXPIRE...

THERE HAVE BEEN NO REPORTS OF FLOODING IN COLLETON AND DORCHESTER 
COUNTIES SINCE EARLIER THIS AFTERNOON...AND WITH THE STEADY RAINS 
HAVING ENDED...THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE.

PLEASE BE AWARE THAT RAINWATER MAY STILL BE COVERING SOME SECONDARY 
ROADS AND IN MANY LOW-LYING AND POOR-DRAINAGE AREAS. THE WORST 
CONDITIONS...WHERE THE HEAVIEST RAINS FELL...WILL BE FROM 
HARLEYVILLE AND ROSINVILLE TO CANADYS...RHODES CROSSROADS...TO THE 
NORTH OF HENDERSONVILLE.

ADDITIONAL RAINS ARE POSSIBLE AGAIN DURING TONIGHT...WITH CURRENT 
FORECASTS SUGGESTING UP TO ANOTHER ONE INCH OF RAIN. HEAVIER AMOUNTS 
ARE MORE LIKELY DURING FRIDAY.  

STAY TUNED TO NOAA WEATHER RADIO OR THIS STATION FOR THE LATEST 
WEATHER INFORMATION FROM THE NATIONAL WEATHER SERVICE. ADDITIONAL 
INFORMATION IS ALSO AVAILABLE ON THE INTERNET AT WCHS.CSC.NOAA.GOV.

$$

PM

The office that day

Everything else NWS Charleston, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 29, 11:41 AM EDT	Flash Flood Warning	CHS	Colleton	79 min
Aug 29, 12:14 PM EDT	Flash Flood Warning	CHS	Dorchester	91 min
Aug 29, 1:36 PM EDT	Flash Flood Warning	CHS	Dorchester	2 hr

Nearby

Flash Flood Warnings in South Carolina, 2002 Every flash flood warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.